Standard Security Scan
Example Input
https://github.com
Sample Output
Security Grade: A+ (100/100 points, HSTS, CSP, and XSS protectors active)
HTTP Header Checker
Security ScoreAnalyze site response headers, view server metadata, and audit security implementations against core benchmarks like CSP, HSTS, and X-Frame-Options.
header-inspector
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What are HTTP Response Headers?
HTTP response headers are metadata parameters sent by a web server to a browser when a page is requested. They contain server details, content encoding schemas, cache rules, and critical security parameters. Auditing response headers helps webmasters confirm that security configurations are correctly implemented to defend against vulnerabilities.
Essential Security Headers for Modern Websites
For maximum security, always configure these core headers: 1) Content-Security-Policy (CSP) to block injection attacks, 2) Strict-Transport-Security (HSTS) to enforce HTTPS connections, 3) X-Frame-Options to block clickjacking, and 4) X-Content-Type-Options (nosniff) to prevent MIME-sniffing exploits. Scoring these configurations reveals vulnerabilities before they can be exploited.
Examples
FAQ
Why is HSTS important?
HTTP Strict Transport Security (HSTS) forces browsers to connect to your site over secure HTTPS connections exclusively, protecting users against SSL-stripping and man-in-the-middle attacks.
How does Content-Security-Policy prevent XSS?
A Content-Security-Policy (CSP) header declares which hosts and script sources are trusted. If an attacker injects a malicious script tag, the browser blocks execution because the source does not match the CSP whitelist.
SEO Toolkit ReferenceAudit website health using our collections of sitemap, robots, redirect, and header checkers.
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